AudioCodes MP-124 User Manual page 131

SIP User's Manual
3.3.4.8.2 Configuring the Tel to IP Routing Table
The 'Tel to IP Routing' page provides a table for configuring up to 50 Tel-to-IP call routing
rules. These rules route Tel calls to destinations based on IP address (or FQDN).
This routing table associates called and/or calling telephone number prefixes (originating
from a specific Hunt Group), with a destination IP address (or Fully Qualified Domain Name
- FQDN) or IP Group. When a call is routed by the device (i.e., a Proxy server isn't used),
the called and calling numbers are compared to the list of prefixes in this table. Calls that
match these prefixes are sent to the corresponding IP address. If the number dialed does
not match these prefixes, the call is not made.
When using a Proxy server, you do not need to configure this table unless you require one
of the following:
Fallback routing when communication with Proxy servers is lost.
Implement the 'Filter Calls to IP' and 'IP Security' features.
Obtain different SIP URI host names (per called number).
Assign IP profiles.
Note that for this table to take precedence over a Proxy for routing calls, set the parameter
PreferRouteTable to 1. The device checks the 'Destination IP Address' field in this table for
a match with the outgoing call. A Proxy is used only if a match is not found.
Possible uses for Tel-to-IP routing include the following:
Fallback to internal routing table if there is no communication with the Proxy servers.
Call Restriction (when Proxy isn't used): rejects all outgoing Tel-to-IP calls that are
associated with the destination IP address 0.0.0.0.
IP Security: When the IP Security feature is enabled (SecureCallFromIP = 1), the
device accepts only those IP-to-Tel calls with a source IP address defined in the 'Tel to
IP Routing' table.
Filter Calls to IP: When a Proxy is used, the device checks the 'Tel to IP Routing' table
before a telephone number is routed to the Proxy. If the number is not allowed
(number isn't listed or a Call Restriction routing rule is applied), the call is released.
Always Use Routing Table: When this feature is enabled (AlwaysUseRouteTable = 1),
even if a Proxy server is used, the SIP URI host name in the sent INVITE message is
obtained from this table. Using this feature, you can assign a different SIP URI host
name for different called and/or calling numbers.
Assign Profiles to destination addresses (also when a Proxy is used).
Alternative Routing (when a Proxy isn't used): an alternative IP destination for
telephone number prefixes is available. To associate an alternative IP address to a
called telephone number prefix, assign it with an additional entry (with a different IP
address), or use an FQDN that resolves into two IP addresses. The call is sent to the
alternative destination when one of the following occurs:
•
No ping to the initial destination is available, poor QoS (delay or packet loss,
calculated according to previous calls) is detected, or a DNS host name is not
resolved. For detailed information on Alternative Routing, refer to ''Configuring
Alternative Routing (Based on Connectivity and QoS'' on page 415).
•
A release reason defined in the 'Reasons for Alternative Tel to IP Routing' table is
received (refer to ''Configuring Reasons for Alternative Routing'' on page 140).
Version 5.8 131
3. Web-Based Management
September 2009